Bond-charge Coulomb repulsion in Peierls-Hubbard models.

Bond-charge Coulomb repulsion in Peierls-Hubbard models.
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Peierls-Hubbard 模型中的键电荷库仑斥力。

DOI:
10.1103/physrevb.38.12043
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发表时间:
1988
期刊:
Physical review. B, Condensed matter
影响因子:
--
通讯作者:
Loh
Loh
中科院分区:
--
文献类型:
--
作者:
Campbell;Gammel;Loh

文献摘要

被引文献

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我们通过添加表示键(W)和混合键-位(X)电子-电子排斥相互作用的最近邻非对角线项,研究了标准Peierls-Hubbard模型的一般适用性,包括现场(U)和最近邻(V)库仑排斥。对于大范围的位对角线Hubbard参数(U,V),我们发现非对角线项(W, X)最初增强二聚化,从而稳定二聚化基态。
We investigate the general applicability of the standard Peierls-Hubbard model, involving both on-site (U) and nearest-neighbor (V) Coulomb repulsions, by adding nearest-neighbor off-diagonal terms representing the bond (W) and mixed bond-site (X) electron-electron repulsive interactions. For a broad range of the site-diagonal Hubbard parameters (U,V), we find that the off-diagonal terms (W, X) initially enhance dimerization, thereby stabilizing the dimerized ground state.